Vision impairment in boys recruited to the iREAD study.

Abstract

Background: Uncorrected refractive error is reported to be the most common cause globally of vision impairment in school age children. However, little is known about the extent of uncorrected refractive error in Israel. The purpose of this study was to investigate the prevalence of vision impairment in schoolchildren recruited for the Israel Refraction, Environment, And Devices (iREAD) Study.

Methods: Healthy boys, ages 5-13 years, were recruited to participate in the iREAD Study. Parents first answered a questionnaire to exclude children with a known history of amblyopia, strabismus, or hyperopia. A comprehensive eye exam was then performed. Presenting visual acuity < 6/12 was defined as vision impairment. Myopia and hyperopia were defined as cycloplegic spherical equivalent refraction  ≤ - 0.50 D, and ≥  + 0.50 D, respectively, and astigmatism as ≤ - 0.75 D. Amblyopia was defined as best corrected visual acuity ≤ 6/12 in at least one eye in the absence of any ocular pathology. Descriptive statistics were used to calculate the prevalence of each refractive error and amblyopia.

Results: Two hundred five boys (average age 8.8 ± 1.7 years) presented for a comprehensive eye exam. The prevalence of vision impairment at initial presentation was 22.9% (N = 47), with 16.1% (N = 33) and 6.8% (N = 14) for both eyes and one eye, respectively. Of the children with vision impairment, 36.2% (N = 17) were wearing habitual correction. Of the children with vision impairment, 97.9% (N = 46) had refractive error, with 85.1% (N = 40) being myopic and 12.8% (N = 6) being hyperopic. In addition, 36.2% (N = 17) with vision impairment had astigmatism. Most children with vision impairment (N = 43) achieved good vision with refractive correction. However, amblyopia was observed in 2.0% (N = 4) of the children.

Conclusions: A high prevalence of vision impairment was observed, primarily due to uncorrected or undercorrected refractive error. Children with amblyopia and/or hyperopia presented despite a parent questionnaire to exclude children with these conditions. Findings suggest that many parents are unaware of their children's visual and refractive status, even for children who already have glasses. In conclusion, improvements to the current system in Israel of vision screenings in first grade should be made to help insure children in need receive adequate follow-up throughout their education.